Adapted by Terence Frisby from his own play. The Broadway production of "There's a Girl in My Soup" opened on Oct. 18, 1967 at the Music Box Theatre and ran for 322 performances. Gig Young and Barbara Ferris were in the original cast.
The film was made and released about four years after its source stage play of the same name by Terence Frisby had been first performed in London's West End in 1966. Frisby also wrote the screenplay for this movie version.
According to the DVD sleeve notes, the film's source stage production was a "long running London West End stage play". It opened in 1966 and ran for around six and half years right up until 1973 playing for over one thousand performances.